Diodes AP3156FVG Quick Start Manual

Features
•
V Range: 2.7V to 5.5V
IN
•
Fully Programmable Current with Single Wire
- 32-Step Logarithmic Scale
- 20/25mA Max Current per Channel
- Four Low Current Settings Down to 50μA
- Low IQ (50μA) for Low Current Mode
•
Tri-Mode 1X, 1.5X, and 2X Charge Pump for
Maximum Efficiency and V
•
Drives up to Six Channels of LEDs
•
Individual Main/Sub-Group Control
•
No Inductors, Low Noise Operation
•
0.5/1/2MHz Constant Switching Frequency
•
Built-In Thermal Protection
•
Built-In Auto-Disable For Open Circuit
•
Automatic Soft Start
•
IQ <1μA in Shutdown
•
Thermally-Enhanced QFN4040-16 Package:
Available in "Green" Molding Compound (No Br,
Sb)
•
Lead Free Finish / RoHS Compliant
Ordering Information
Device
AP3156FVG
AP3156FVG-EVM Rev.1
HIGH EFFICIENCY CHARGE PUMP WHITE LED DRIVER
Coverage
F
Package Code Packaging
FV QFN4040-16
www.diodes.com
AP3156 Evaluation Module
Description
The AP3156 is a low noise, constant frequency
charge pump DC/DC converter that uses a tri-mode
(1X, 1.5X and 2X) conversion to maximize efficiency
for white LED applications. It is capable of driving
LEDs at a total of 120mA maximum from a 2.7V to
5.5V input. The six channels may be operated
individually or in parallel for driving higher-current
LEDs.
A low external parts count (two 1μF flying capacitors
and two small 1μF capacitors at V
this device ideally suited for small, battery-powered
applications. A serial digital input is used to enable,
disable and set current for each LED with a 32-level
logarithmic scale plus four low-current settings down
to 50μA for optimal efficiency, with a low quiescent
current of only 50μA. Each output of the AP3156 is
equipped with built-in protection for V
and auto-disable for LED failure conditions. Built-in
soft-start circuitry prevents excessive inrush current
during start-up. A shutdown feature disconnects the
load from VIN and reduces quiescent current to less
than 1μA.
1 of 5
and V
IN OUT
short circuit
OUT
EVM Part Number
AP3156FVG-EVM
OCTOBER
©
Diodes Incorporated
) makes
2009